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authorGaurav Kumar Garg <garg.gaurav52@gmail.com>2015-12-28 11:46:54 +0530
committerAtin Mukherjee <amukherj@redhat.com>2015-12-28 22:26:01 -0800
commitc0cc93dfe6fc63caeae9448dc689adcf13ea3aae (patch)
treeca43fda901afb6ec405d87c84a553cb9841994eb /xlators/features/index
parent15965dd310192cae8f05fddda309e77ff5c72ca2 (diff)
glusterd: reduce friend update flood
This patch is backport of: http://review.gluster.org/#/c/12999/ When in a befriended state, glusterd would broadcast friend updates to all other peers whenver a ACC or LOCAL_ACC event occurred. When a downed glusterd came back up and established connections again, this lead to a flood of friend updates to happen on the order of N^2 (N is the number of peers in the cluster) In larger clusters this was problematic, and could lead to very long times for the cluster to settle down when a peer came back up. Multiple peers coming back up at the same time would compound the problem. Broadcasting of friend updates doesn't have much use in places other that during a peer probe. Instead of broadcasting friend updates on connection re-establishment, updates can just be exchanged between the peers involved in the connection. This patch changes the glusterd friend state-machine to send updates only to the required peer for ACC or LOCAL_ACC events when in befriended state. The number of updates sent now is in the order of N. For a 10 node cluster, the number of updates reduced by 5 times. When creating the 10 node cluster, the updates reduced from ~500 to ~150. When a glusterd restarted, the number of exchanges reduced from ~160 to ~35. >> BUG: 1292749 >> Change-Id: Ib6072090c7069b081d018cdaa3dc878819ab1d18 >> Signed-off-by: Kaushal M <kaushal@redhat.com> >> Reviewed-on: http://review.gluster.org/12999 >> Reviewed-by: Atin Mukherjee <amukherj@redhat.com> >> Tested-by: NetBSD Build System <jenkins@build.gluster.org> >> Tested-by: Gluster Build System <jenkins@build.gluster.com> Change-Id: I389de2cc224f0ed627d98ae062209dd4f93e3b19 BUG: 1294410 Signed-off-by: Gaurav Kumar Garg <ggarg@redhat.com> Signed-off-by: Kaushal M <kaushal@redhat.com> Reviewed-on: http://review.gluster.org/13095 Reviewed-by: Atin Mukherjee <amukherj@redhat.com> Tested-by: NetBSD Build System <jenkins@build.gluster.org> Tested-by: Gluster Build System <jenkins@build.gluster.com>
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